Hammer Mechanical Mod Also known as the “Chammer”, the Hammer Mechanical Mod offers a number of features that starts with the eye-catching laser engraved logo on its chrome-brass exterior. Complete with two battery tubes so that you can choose between the following batteries; - 18350 - 18500 - 18650 The battery choices allow for greater flexibility while the ergonomic design sits in your hand. This product is easy to use and quite stylish as well. Amid the great features are the floating firing pin and the locking ring each of which works smoothly for maximum efficiency. For those who are looking for mod in pipe form, then the “Chammer” is the one for you. Warning: Do not stack the batteries because the mechanical design will essentially raise the voltage twice over and will destroy the attached parts of the Hammer mod.